GNSS Settings

When there is a need to pause the scenario rather then stopping and starting over, use these buttons. The Pause button pauses the scenario at its current file location, and upon clicking Resume, the scenario starts where it paused. The Pause and Resume buttons occupy the same space. When Pause is clicked, it changes to Resume. After Resume is clicked, it changes back to Pause.

Restart

Coupling: Active while playing a scenario in Navigation mode.

Click the button to restart the scenario (Navigation mode) or a static test (Static Test mode).

If a Scenario Start Time Offset value is entered, the software restarts the scenario at the entered offset time value. The progress bar also restarts from the offset value.

Restart does not perform a power calibration. When modifying parameters that may affect the power level such as Scenario Start Time Offset, it is recommended that you perform a power calibration to attain the proper test results. To perform a power calibration if the power calibration is set to Auto, click Play , otherwise click the active Calibrate Power button to perform a manual power calibration. For more information on power calibrations, refer to the PXB User Interface, Menu Bar descriptions.

Reset Channels

Coupling: Available only when the signal is not playing

Click the button to reset the current satellite channel settings in the Satellite Settings node with the exception of the Enabled column:

Navigation mode	Resets values according to the start record of the current scenario.
Static Test mode	Resets values to default settings. After starting the test, the software updates the Power Offset (dB) column with values derived from the power calibration.

Disable UTC Display/Enable UTC Display

Default: Disable UTC Display

Coupling: Active while playing a scenario in Navigation mode.

The Disable UTC Display and Enable UTC Display buttons occupy the same space. When Disable UTC Display is Closed clicked, it stops the progress bar from displaying any further progress and stops the scenario time counter located to the right of the progress bar. In addition the button name changes to Enable UTC Display. While the progress bar and scenario time counter stops, the scenario continues to play. When Enable UTC Display is clicked, the software updates the progress bar and scenario time counter to the current location in the scenario playback and the button name changes back to Disable UTC Display.

Progress Bar

Coupling: Active while playing a scenario in Navigation mode.

The Closed Progress Bar shows the UTC time of Scenario playback and it displays in two different modes:

When using User Scenario Files, the progress bar shows the progress.
When the Signal Source is Scenario Generator Settings, that means real time generation, it shows as a bouncing bar.

Parameters

1. Capability

Capability

This read only property shows that the GNSS software is configured for advanced real-time signal generation.

2. General

Simulation Mode

Choice: Navigation | Static Test

Default: Navigation

Select the simulation mode of GNSS signal. Navigation mode will create satellites data or load it from a scenario file to simulate GNSS signal in a real world. Static Test mode simulates a static GNSS signal by configuring each satellite's properties.

Navigation	Simulates a real-world GNSS signal by reading the satellite data from a scenario file. Within the Satellite Settings tab, you can deselect active satellites and change the relative power between satellites while the signal is playing.
Static Test	Simulate a static GNSS signal where the satellite channels and settings are initialized by a scenario file, but do not change with time (as if the satellites were frozen in time). Within the Satellite Settings tab, reconfigure the properties for each active satellite initialized by the scenario file, and manually activate and configure the properties for inactive satellites.

Scenario Source

Choice: User Scenario File | Scenario Generator Settings

Default: User Scenario File

Select the type of scenario data source for playback.

User Scenario File indicates that it will load an existing scenario file for playback, while Scenario Generator Settings means that it will start a real-time scenario generation and playback based on the settings under Scenario Generator node.

Scenario File

Default: C:\Program Files\Agilent\PXB\Infrastructure\Applications\Gnss\Scenarios\20110709_Beijing.ags

Couplings:

In Navigation mode, this parameter is only visible when Scenario Source is User Scenario File, and the scenario information automatically updates after changing to a new scenario file.
In Static Test mode, the satellite channels initialize with the starting record in the scenario file.

Select a scenario file for playback in Navigation mode or to initialize satellite channels in Static Test mode. The Signal Studio software comes with factory supplied scenario files. To create custom scenario files for playback selection, use the Scenario Generator.

Scenario Start Time Offset

Range: 0 - Duration of scenario

Default: 0.0

Coupling: Available with the Navigation selection in the Simulation Mode cell.

Enter an offset value in seconds with resolution of three seconds, which indicates the starting position of the scenario playback.

When the Scenario Source selection is Scenario Generator Settings, a change to the offset does not provide an offset, but instead changes the Start Date Time (GPS Time) set in the Scenario Generator tab by the amount of the entered offset.

If the user modifies the Scenario Start Time Offset value and applies the change by clicking the Restart button, the elapsed scenario run-time display may have an error of up to one second. The error, if it occurs, is caused by the different clock rates between the clock for the FPGA/DSP (generates the real-time signal) and the clock for the host CPU that controls the display update. The amount of error depends upon the point in the clock timing where the Restart occurs.

Satellite Power Control

Choices: Equal Power | Range Based

Default: Equal Power

Coupling: Available with the Navigation selection in the Simulation Mode cell.

Select the satellite power control mode for all satellites used in the scenario.

Equal Power	All satellites have the same power level.
Range Based	The power level of each satellite is calculated based on its pseudorange value.

3. Constellation Control

GPS Enabled

Choice: On | Off

Default: On

Enable or disable GPS constellation in currently playing scenario.

GLONASS Enabled

Choice: On | Off

Default: On

Enable or disable GLONASS constellation in currently playing scenario.

Galileo Enabled

Choice: On | Off

Default: On

Enable or disable Galileo constellation in currently playing scenario.

Beidou Enabled

Choice: On | Off

Default: On

Enable or disable Beidou constellation in currently playing scenario.

GPS Relative Power Scale

Range: -40 dB to 40.00 dB

Default: 0 dB

Enter the power offset of the GPS constellation, relative to the original power level in the scenario file. This will be applied to all GPS satellites in the scenario.

GLONASS Relative Power Scale

Range: -40 dB to 40.00 dB

Default: 0 dB

Enter the power offset of the GLONASS constellation, relative to the original power level in the scenario file. This will be applied to all GLONASS satellites in the scenario.

Galileo Relative Power Scale

Range: -40 dB to 40.00 dB

Default: 0 dB

Enter the power offset of the Galileo constellation, relative to the original power level in the scenario file. This will be applied to all Galileo satellites in the scenario.

Beidou Relative Power Scale

Range: -40 dB to 40.00 dB

Default: 0 dB

Enter the power offset of the Beidou constellation, relative to the original power level in the scenario file. This will be applied to all Beidou satellites in the scenario.